Chelates for the control of metaldeficiency phenomena in biological systems

ABSTRACT

HEAVY METAL CHELATES OF ETHYLENEDIAMINETETRAACETIC ACID DERIVATIVES   R-NH-CO-CH2-N(-CH2-COOH)-CH2-CH2-N(-CH2-COOH)-CH2-CO-NH-R   ARE USEFUL FOR THE CONTROL OF METAL-DEFICIENCY PHENOMENA IN BIOLOGICAL SYSTEMS. IN THE FORMULA R REPRESENTS THE PHENYL OR NAPHTHYL RADICAL WHICH CAN BE SUBSTITUTED BY HALOGEN, HYDROXY, MERCAPTO, NITRO, CYANO, THIOCYANO, ALKYL, ALKOXY, MERCAPTO, NITRO, CYAMINO ACYLIXY, CARBOXYL, ALKOXYCARBONYL, ACRBAMOYL, PYRIDOYLAMINO, N-CARBOXYALKYL-CAARBAMOYL, SULPHO, SULPHAMOYL, MONO- OR DIALKYLATED OR PHENYLATED SULPHAMOYL WHICH CAN ALSO CARRY ONE OF THE GROUPS   -CH2-CH2-SO3-H OR-CH2-COOH   ALKYLSULPHONYL, ALKOXYSULPHONYL, OR BY AN OPTIONALLY HYDROXY-CONTAINING PHENYLSULPHONY OR PHENOXYSULPHONYL; OR WHEREIN R REPRESENTS THE PYRIDINE OR QUINOLINE RADICAL WHICH CAN BE SUBSTITUTED BY HALOGEN, HYDROXY ALKYL, OR CARBAMOYL.

3,833,590 CHELA'I'ES FOR THE CONTROL OF METAL- DEFICIENCY PHENOMENA IN BIOLOGICAL SYSTEMS Joachim-Dazzi, Rieheu, Switzerland, assignor to Ciba- Geigy Corporation, Ardsley, N.Y.

NoDrawiug. Filed July 24, 1972, Ser. No. 274,377

priority, application Switzerland, July 29, 1971,

v 11,172/71 Int. 01. con 101/26; (:07: 15/02 Us. or. 260-270 R 14 Claims 1 ABSTRACT OF THE DISCLOSURE 1 Heavy metal chelatesof ethylenediaminetetraacetic acid derivatives R-NH-C-CHr-N CH2--CH:-NCH2C-NHR (I OH O OH are useful for the control of metal-deficiency phenomena in biological systems. the formula R represents the phenyl or naphthyl radical which can be substituted by halogen, hydroxy, mercapto, nitro, cyano, thiocyano, alkyl, alkoxy, halogenoalkyl, acyl, acylamino, acyloxy, carboxyl, alkoxycarbonyl, carbamoyl, pyridoylamino, N-carboXyalkyl-carbamoyl, sulpho, sulphamoyl, monoor dialkylated or phenylated sulphamoyl which can also carry one of the groups alkylsulphonyl, alkoxysulphonyl, or by an optionally hydroxy-containing phenylsulphonyl or phenoxysulphonyl; or wherein R' represents the pyridine or quinoline radical which can be substituted by halogen, hydroxy,

alkyl, or 'carbamoyl.

Chelating agents are already known and are employed inima'ny commercialfields. The chelating agent with the .widest'field of application is ethylenediaminetetraacetic acid. It is alreadyknown that metal chelates of ethylenediaminetetraacetic acid EDT A, as well as of other chelatiron(IIDhydrOxide anda soluble salt of ethylenediaminetetraacetic acid. It is consequently not possible for this chelate to be successfully used for the correction of metal- ,deficiency' phenomena occurring in plants growing in alkaline soil. V n I p 7 4 I V It'has'recently been suggested that the iron chelates of hydroxyethylenediaminetriacetic acid, and of certain ethvylene-bis-(at-imino-o-hydroxyphenylacetic acids), likewise be used for plant nutrition. These chelates are somewhat more effective than the chelates of ethylenediaminetetraacetic acid, but do not, however, possess the desired stability over a wide pH-range (Brit. Pat. No. 832,989).

The present invention describes new chelating agents 7 which are capable of complex-formation with metal ions,

especially with iron(HI) ions, which are stable in a wide .;pH-range. They are thus suitable for the correction of metal-deficiency phenomena occurring both in plants growing in acid soils and in plants growing in alkaline soils. The new chelating agents are also suitable for use in other fields for which chelating agents have already been employed, e.g. for analytic chemistry.

Patented Sept'. 3, 1974 m Ce The new chelating agents are derivatives of ethylenediaminetetraacetic acid and correspond to formula I:

R represents the phenyl or naphthyl radical which can be substituted by halogen, hydroxy, mercapto, nitro, cyano, thiocyano, alkyl, alkoxy, halogenoalkyl, acyl, acylamino, acyloxy, carboxyl, alkoxycarbonyl, carbamoyl, pyridoylamino, N-carboxyalkyl-carbamoyl, sulpho, sulphamoyl, monoor dialkylated or phenylated sulphamoyl, alkylsulphonyl, alkoxysulphonyl, or by an optionally hydroxy-containing phenylsulphonyl or phenoxysulphonyl; or R represents the pyridine or quinoline radical which can be substituted by halogen, hydroxy, alkyl or carbamoyl. Alkyl radicals in formula I are lower radicals having 1 to 6 carbon atoms in a straight or branched chain, i.e.

the methyl, ethyl, n-propyl, isopropyl, isobutyl, n-butyl,

sec-butyl, or tert-butyl radical, as well as the n-pentyl and n-hexyl radical and isomers thereof. The mentioned radicals form also the alkyl moiety of alkoxy, alkoxycarbonyl, alkylat'ed sulphamoyl, N-carboxyalkyl-carbam oyl, alkylsulphonyl or alkoxysulphonyl radicals; As halogenated radicals, C C -alkyl' radicals can be monoor polysubstituted by fluorine, chlorine, bromine or iodine; the trifluoromethyl radical is preferred. To be mentioned as acyl radicals are, inparticular, alkanoyl radicals such as the acetyl or propiouyl radical, or a benzoyl radical substituted by hydroxy and carboxyl. Acyloxy or acylamino radicals likewise preferably contain these substituents. Halogen can be fluorine, chlorine, bromine or iodine.

A sulphamoyl radical can also be substituted by the group For the production of metal chelates, such ethylenediaminetetraacetic acid derivatives of formula I' are preferred, by virtue of the particularly good properties of the chelates, wherein R representsa phenyl radical containing a maximum of four substituents from the group hydroxyl, sulpho, sulphamoyl, monoor di-lower-alkylsulphamoyl, SO NH-CH C H SO H, carboxyl, alkoxycarbonyl, methylsulphonyl, cyano, nitro, chlorine, bromine or acetyl; or wherein R'represen'ts a pyridyl radical, hydroxypyridyl radical, pyridoylamino radical or a carbamoylpyridyl radical.

The active substances according to the invention are obtained by the reaction of the anhydride of ethylenediaminetetraacetic acid 0 N-CHz-CHz-N O (l'f -H C CHr-C 0 II C with 2 equivalents of an amine of formula II (a) the anhydride of the EDTA is' taken into solution at refluxing temperature, and the amine, likewise in solution, added; or

(b) =both reactants are suspended in the given solvent and the suspension heated, with vigorous stirring, to the reflux temperature; or preferably (c) the amine is taken into solution, and the dissolved anhydride of the EDTA added dropwise at the reflux 5 temperature.

whilst still moist to the corresponding metal chelate. This reaction is performed with a heavy metal compound, preferably with iron(III) chloride, in the presence of water,

or of alkanols such as methanol or ethanol, and alkali metal hydroxides such as sodium or potassium hydroxide, or in the presence of ammonium hydroxide.

It was determined by measurements that these complexes are stable over a wide pH-range, particularly up to pH 10. They can therefore be used with excellent success also in alkaline soils, whereas the chelates of ethylenediaminetetraacetic acid are used only in acid soils, since they decompose in neutral or in slightly alkaline soils.

The process according to the invention for the production of the new compounds of formula I is illustrated by the following examples. The term parts denotes parts tered off, washed with "ca; 200 ofacetohitrile, aiid dried at 80. The yield is 95% of the theoretical value. The obtained N,N'-bis-(carboxymethyl)-N,N'-bis-(2-hydroxyacetanilido)-1,2-diaminoethane of formula I (R.= 2- hydroxyphenyl) melts at 207208 with decomposition.

EXAMPLEZ 'A mixture consisting of 20.5 g. of 1,2-bis-[2',6 -di'oxomorpholinyl-(4)]-ethane (anhydride of EDTA), 23 g. of 2-amino-4-chlorophenol and 300 ml. of isopropanolis very rapidly stirred for 1.5 hours in a 750 ml. sulphating flask. After cooling, an amount of '40.9 g.,(=,.9 14%"-0 f droxy-S-chloroacetanilido)-1,2-diamiuoethane is isolated at 20,M.P.237238. 'IE

EXAMPLE 3 An amount of 45 g. of N,N'-bis- (carboxymethyl)-N,N'- bis-(Z-hydroxy 5 chloroacetanilido)-1,2-diaminoethane (obtained by the process described in Example 1'or-2) is suspended in 160 ml. of ethanol. An addition is made dropwise to this susperisiom'with stirring, of 14.4 g. of iron(III) chloridein 80 ml. of ethanol, and then slowly one of 14.4 g. of sodium hydroxide in 150 ml. of ethanol. The reaction mixture heats up to 40. Stirring is continued for two hours; the solvent is then evaporated off, and the residue dried for 24 hours at 80/ 12 mm.'..:. ,I.

The obtained monosodium salt of N,N-bis-(car boxymethyl)-N,N'-bis(2-hydroxy 5 chloroacetanilido)-1,'2- diaminoethane-iron(III) complex decomposes from 200 and gives the following analysis values: l

Calculated: C 32. 6, H 2.7, N 6.9, Na 11.3, C1 213, Fe

6.9% Found: C 33.2, H 3.1, N

6.9, Na 1017, 01 21.1, Fe 7.1%

by weight, and temperatures are expressed in degrees Centigrade. EXAMPLE 4' Further compounds of formula I which were produced by the described processes are listed in the table attached An amount of 19 g. of 2-aminophenol 4-sulphonie acid to the examples. The characterisation of some compounds is dissolved at 0 in 50 ml. of 2N NaOH ina beaker, and in the form of their alkali metal salts is done mainly for 40 the solution rapidly stirred. Whilstic'e-cooling' is applied, practical reasons, in that chelation with the polyvalent 12.8 g. of 1,2-bis-[2,6-dioxomorpholinyl-(4) ]-ethane is metal cation, as mentioned above, is performed as a rule introduced within a period of 2 minutes;'the'pH-'value from the alkali-metal-salt form. Compounds having acid decreases rapidly from 6.3 to 4.8, and then remains congroups are in some cases characterised in several forms: stant at pH 4 during the subsequent reaction time-There is as aclds, as and salts or as neutral salts. obtained from the reaction mixture an amount of 34 EXAMPLE 1. of the Na-salt of N,N'-bis-(carboxymethyl);N,N'-bis{(2- hydroxyphenyl 5 sulphomc ac1d)-1,2-d1aminoethane Amounts of 200.2 g. of 2-am1nophenol and 1.8 lltres of (R:2-hydroxyphenylsulphonic acid sodium salt), M.P. acetonitrlle are heated within 10 minutes 1n a nitrogen 240 242 (decomposition) [compound 43]." atmosplulqre, W1th StlIrlIlg, the refluxing perature. Further compounds of formula I: 7 An addition is made to the obtained solution at the same i :2 temperature, n the course of 30-40 minutes, of 232 g. of z HnCHQ+N-OHZO-NH+R 1,2-b1s-[2,6-d1oxomorpholinyl-(4)]-ethane dissolved hot (it f 3 111 5 6 lltres of acetonitrile, a crystalline product being gbtained tZfterfl2-3 minutes. Stirring is continued for 16 OOH OOH ours wi re uxing, and the reaction mixture then alwere obtained b I I y the processes described in Examples 1 lowed to cool to room temperature. The crystals are fil- 2 and 4, wherein has the following meanings: f

' M 1n R 2:01 5 Compound number; 1 CH; E 011 2..:.::::: 3 C O OH Tests for the control of chlorosis (a) 10-14 Day-old tomato and oat plants exhibiting clear symtoms of chlorosis produced by an Fe+++free nutrient solution are placed into. anutrient solution ac-, cording to Hewitt*, the solution containing the iron chelate in concentrations ofjlO and 1 mg. of iron per litre, respectively. The pH value is stabilised at 7.5-8 by. rneans ofja'butferj solution The'results of the test are evaluated after 14 days.

The commercial product Na/Fe-diethylenetriaminepentaaceticacid (.=Sequestrene 330 Fe) taken as a comparisonjcaused, compared' with'the. iron chelates of the'pre sentinvention, a slight change of colour of the solid preparations: dusts, scattering agents, granulates,-

(coated granulates, impregnated granulates and homo' geneous granulates);

water-dispersible concentrates of the active substances wettable powders and pastes; liquid preparations: solutions.

The solid preparations (dusts, scattering agents, granulates) are produced by the mixing of the active substances with solid carriers. Suitable carriers are, e.g. kaolin, tal-I cum, bole, loess, chalk, limestone, ground limestone Attaclay, dolomite, diatomaceous earth, precipitated silicio leaves from yellow to green. 15 acid, alkaline-earth silicates, sodium and potassium- I Oat plants Tomato plants Oat; plants Tomato plants Compound 10 v10 7 Compound 10 10 number p.p.m 1p.p.m. p.p.m. 1p.p.m number p.p.m. 1p.p.m p.p.m. 1p.p.m.

" "+4 1 O 0' i5 ii ii i+ ii ii i i+ 1 1:: ii 0 i Sequestrene f+ 3801 0 0 Concentration of e Compound number:

Explanation:

, ++=leaves deepgreen '+=1eaves light green O=leavesyellow (chlorosis). Agents according to the invention are produced in a manner known per ,se' by the intimatemixing and grinding of active'substances with suitable carriers, optionally, with the additionof dispersing agents or solvents which *E. K. Hewitt (.fSand and water culture methods used in the study of plant nutrition, Techn. Comm. No, '22, Commonwealth Bureau of Horticulture and Plantation Crops, East Malling, 1966). v

aluminium silicates (feldspar and mica), calcium and magnesium sulphates, magnesium oxide, ground plastics, fertilisers such as ammonium sulphate, ammonium phosphate, ammonium nitrate, urea, ground vegetable products such as bran, bark dust, saw dust, ground nutshells, cellulose powder, residues of plant extractions, active charcoal, etc., alone or in admixture with each other.

The particle size of the carriers is for dusts advantageously up to about 0.1 mm.; for scattering agents from about 0.075 mm. to 0.2 mm.; and for'granulates 0.2 mm. or coarser.

The concentrations of active substance in the solid preparations are from 0.5 to

It is possible to add to these mixtures also additives stabilising the active substance, and/or non-ionic, anionactive, and cation-active substances, which, for example, improve the adhesiveness of the active substances (ad-.

hesives and agglutinants), and/or ensure a better wettability (wetting agents) and dispersibility (dispersing agents). Suitable adhesives are, for example,. the"- following: olein/chalk mixture, cellulose derivatives (methyl cellulose, carboxy methyl celluose), hydroxy-' acid, its alkali metal and alkaline-earth metal salts, poly-- ethylene glycol ethers (carbowaxes), fatty alcohol polyglycol ethers having 5 to 20 ethylene oxide radicals per molecule and 8 to 18 carbon atoms in the fatty alcohol moiety, condensation products of ethylene oxide, ,propyl ene oxide, polyvinyl pyrrolidones, polyvinyl alcohols,

condensation products of urea and formaldehyde, as well as latex products.

Water-dispersible concentrates of active substances, i.e.,. wettable powders and pastes, are agents which can'be a diluted with water to obtain any desired concentration. They consist of active substance, carrier, optionally addi-' tives I which stabilise the active substance, surface-active substances, and anti-foam agents. .The concentration of active substance in these agents is 580% .Thewettable powders and the pastes are obtained by the mixing and grinding of the active substances with dispersing agents and pulverulent carriers, in suitable devices, until homogeneity is attained. Suitable carriers are, eig. those previously mentioned in the case of the solid preparations. It is advantageous in some cases to use mixtures of difierent carriers. It is possible to use as dispersing agents, e.g.: condensation products of sulphonated naphthalene and sulphonated naphthalene derivatives with formaldehyde, condensation products of naphthalene or of naphthalenesulphonic acids with phenol and formaldehyde, as well as alkali, ammonium and alkalineearth metal salts of ligninsulphonic acid, also alkylaryl sulphonates, alkali metal salts and alkaline-earth metal salts of dibutyl naphthalenesulphonic acid, fatty alcohol sulphates such as salts of sulphated hexadecanols, heptadecanols, octadecanols, and salts of s'ulphated fatty alcohol glycol ether, the sodium salt of oleyl methyl tauride, ditertiary acetylene glycols, dialkyl dilauryl. ammonium chloride, and fatty acid alkali-metal and alkaline-earth metal salts.

Suitable anti-foam agents are, for example; silicones.

The active substances are so mixed, ground, sieved. and strained-with the above mentioned additives that the solid constituent in the case of wettable powders has a particle size not exceeding 0.02 to 0.04 mm. and inthe case of pastes not exceeding 0.03 mm. Dispersing agents such as those mentioned in the preceding paragraphs and water are used in the preparation of pastes.

Furthermore, the agents according to the. invention can be used in the form of solutions. For this purpose the active substance (or several active substances) is (or are) dissolved in suitable organic solvents, mixtures of solvents, water, or mixtures of organic solvents with water. The solutions should contain the active substance ina concentration of from 1 to These solutions can be applied with the aid of sprays.

.Other biocidal active substances or agents may be added to the described agents according to the invention. For the Widening of their sphere of action, the new agents may also contain, in addition to the stated compounds of the general formula I, e.g. insecticides, fungicides, bactericides, fungistatics, bacteriostatics or nematocides. The agents according to the invention can also confertilisers, other trace elements, etc.

Preparations of the new active substances are described in the following. The term parts denotes parts by weight. v

. Y Wettable powder The following constituents are used for the preparation (a) of a 50%, (b) of a and (e) of a 10% wettable powder: I

50parts of the monosodium salt of the iron (III) comgplex of .the compound mentioned in Example 2, 5 parts of sodium dibutylnaphthyl sulphonate,

3 parts 7 of naphthalenesulphonic acid/phenolsulphonic I I acid/formaldehyde condensate 3 :2: 1, 201parts of kaolin, 22 parts .of Champagne chalk;

the iron(III)-com- 1 6:? V 5 parts of neutral pota'ssium 'alumi'nium silicate, 62 parts of kaolin; v 1 i 10 parts of the monosodium salt of the iron(III -complexof the compoundNo. 3,- Z

3 parts of a mixture of sodium salts of saturatedfat ty alcohol sulphates, r

5 parts of naphthalen'esulphonic' acid/formaldehyde con densate, 82 parts of kaolinr powders by dilution withiwater. J

' Paste L The following of compound No. 34, 5 parts of sodium aluminium silicate,

14' parts of cetyl pblyglycol. ether ethylene oxide,

1 part of oleyl polyglycol ether haVing S moles of .ethyle oxide,

2' parts of spindle oil,.l

chelates according' to' Claim 1, wherein -R' represents substituted phenyl which contains 'a maximum of three substitutents from the group-hydroxy, sulpho, sulph= 10- parts of polyethylene glycol,

I-23'part's of water. i p l Theactive substance is intimatelyf mixed and grotind; in suitable apparatus, with the additives. Apaste isfo bw tained from which can be prepared, by dilutionhwith water, suspensions of'any 'des'ired concentrationq Patent'claimsy 1. Ethylenediaminetetraacetic acid derivatives of'formula I and their alkali-metal salts andfe'rric chelates wherein R represents naphthyl; phenyl or naphthyl substituted by halogen, hydroxy, mercapto, nitro, cyano, thi'ocarboxyl, alkoxycarbonyl' having '*C1C3':a1kyl groups, carbamoyl, pyridoylamino, N-carboxyalkylcarbamoy-l having C -C alkyl-groups, sulpho, sulphamoyl, monoor di-C CgI alkyl, groups,. sulpho nsul-phamoyl, monoor di-C C -alkylatecl or phenylated' sulpharnoyl sub-' ing C -C .alkyl groups, methylsulphonyl, cyano, nitro, chlorine, bromine, or acetyl; pyridylphydroxypyridyl; pyridoylamino or carbarnoylpyridyl.

lkali me 3. Compounds and. their aiiioyl, monoor di,-C -C -al kylsulphamoyl,

, substances are usedtfor the preparation; of a 45% paste: a 1 V 45 parts of the monosodium salt of the iron(III)-compl having 8, moles;

1 7 -SO NH--CH COOH, carboxyl, alkoxycarbonyl having C -C alkyl groups, methylsulphonyl, cyano, nitro, chlorine, bromine, or acetyl.

4. The compound of the formula:

HOzS

Hr-COOH H 2 and its alkali-metal salts and ferric chelates according to Claim 1.

5. The compound of the formula:

NH-C O-GHz-N-CHr- Hr-COOH Hogs H 2 and its alkali-metal salts and ferric chelates according to Claim 1.

6. The compound of the formula:

-NH-C O-GHPIII-CH? CHz-COOH O OH 2 and its alkali-metal salts and ferric chelates according to Claim 1.

7. The compound of the formula:

and its alkali-metal salts and ferric chelates according to Claim 1.

8. The compound of the formula:

HaNOzS Hr-COOH H 2 and its alkali-metal salts and ferric chelates according to Claim 1.

9. The compound of the formula:

and its alkali-metal salts and ferric chelates according to Claim 1.

10. The compound of the formula:

\N NH-OO-CHr-N-CHr- CHr-OOOH 2 and its alkali-metal salts and ferric chelates according to Claim 1.

11. The compound of the formula:

I Ha-COOH cm H 2 and its alkali-metal salts and ferric chelates according to Claim 1.

12. The compound of the formula:

and its alkali-metal salts and ferric chelates according to Claim 1.

13. The compound of the formula:

H2- COOH H and its alkali-metal salts and ferric chelates according to Claim 1.

14. The compound of the formula:

NH-C O-GHr-N-CHP Hz-COOH OOH 2 and its alkali-metal salts and ferric chelates according to Claim 1.

References Cited UNITED STATES PATENTS IMAI, Die Makromolekolare Chemie 138 (1970), pp. 293-7.

PATRICK P. GARVIN, Primary Examiner A. P. DEMERS, Assistant Examiner US. Cl. X.R.

71-1; 260287 R, 295 RM, 429 J, 465 D, 439 R, 471 A, 471R, 507 R, 518 R, 53413 UNITED STATES PATENT OFFICE CERTIFICATE OF CURRECTION Patent 3,833,590 Dated September 3, 1974 Q Inventor(s) Joachim Dazzi It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 16, Claim 1, lines 52 and 53, delete "alkyl groups,

sulpho, sulphamoyl, monoor diC -C Column 16, line 53, between "sulphamoyl" and "substituted",

insert monoor diC C alkylated or phenylated sulphamoyl" e Column 18, Claim 13, in the formula, insert a sub-script 2 after the closing bracket gigncd and ficalcd this Q second Day Of September 1975 [SEAL] Arrest:

0 RUTH C. MASON c. MARSHALL DANN Arresting Officer Commissioner ()[PLUFHIS and Trademarks FORM PO-wSO (10-59) USCOMM-DC 60376-P69 & U.$. GOVERNMENT PRINTING OFFICE I959 0-356-33, 

